InputDataReader handles all data input, i.e. data needed to prepare
computation (topology, calibration measurements, etc.).
TopologyReaderCSV reads topology from a CSV file (just Building and Area
for the moment).
cfg/topo.csv: change format (add building name and reorder coordinates).
UserInterface: add data input options.
posexcept: add data input exceptions.
Add Positioning creation in owlps-positioning, so the program is usable,
configuration is checked in Positioning, Input and Output, and objects
are created and run normally.
UserInterface: Minor modification, config_file_name is not initialised
in constructor anymore, it is now a default value of the configuration
entry "config-file".
Matteo Cypriani